frostfs-s3-gw/api/layer/cors.go

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package layer
import (
"bytes"
"context"
"encoding/xml"
errorsStd "errors"
"fmt"
"io"
"github.com/nspcc-dev/neofs-s3-gw/api/data"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"go.uber.org/zap"
)
const wildcard = "*"
var supportedMethods = map[string]struct{}{"GET": {}, "HEAD": {}, "POST": {}, "PUT": {}, "DELETE": {}}
func (n *layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
var (
buf bytes.Buffer
tee = io.TeeReader(p.Reader, &buf)
cors = &data.CORSConfiguration{}
)
if err := xml.NewDecoder(tee).Decode(cors); err != nil {
return fmt.Errorf("xml decode cors: %w", err)
}
if cors.CORSRules == nil {
return errors.GetAPIError(errors.ErrMalformedXML)
}
if err := checkCORS(cors); err != nil {
return err
}
prm := PrmObjectCreate{
Container: p.BktInfo.CID,
Creator: p.BktInfo.Owner,
Payload: p.Reader,
Filename: p.BktInfo.CORSObjectName(),
}
objID, _, err := n.objectPutAndHash(ctx, prm, p.BktInfo)
if err != nil {
return fmt.Errorf("put system object: %w", err)
}
objIDToDelete, err := n.treeService.PutBucketCORS(ctx, p.BktInfo.CID, objID)
if err != nil {
return err
}
if objIDToDelete != nil {
if err = n.objectDelete(ctx, p.BktInfo, *objIDToDelete); err != nil {
n.log.Error("couldn't delete cors object", zap.Error(err),
zap.String("cnrID", p.BktInfo.CID.EncodeToString()),
zap.String("bucket name", p.BktInfo.Name),
zap.String("objID", objIDToDelete.EncodeToString()))
}
}
if err := n.systemCache.PutCORS(systemObjectKey(p.BktInfo, prm.Filename), cors); err != nil {
n.log.Error("couldn't cache system object", zap.Error(err))
}
return nil
}
func (n *layer) GetBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) (*data.CORSConfiguration, error) {
cors, err := n.getCORS(ctx, bktInfo, bktInfo.CORSObjectName())
if err != nil {
if errorsStd.Is(err, ErrNodeNotFound) {
return nil, errors.GetAPIError(errors.ErrNoSuchCORSConfiguration)
}
return nil, err
}
return cors, nil
}
func (n *layer) DeleteBucketCORS(ctx context.Context, bktInfo *data.BucketInfo) error {
objID, err := n.treeService.DeleteBucketCORS(ctx, bktInfo.CID)
if err != nil {
return err
}
if objID != nil {
if err = n.objectDelete(ctx, bktInfo, *objID); err != nil {
return err
}
}
n.systemCache.Delete(systemObjectKey(bktInfo, bktInfo.CORSObjectName()))
return nil
}
func checkCORS(cors *data.CORSConfiguration) error {
for _, r := range cors.CORSRules {
for _, m := range r.AllowedMethods {
if _, ok := supportedMethods[m]; !ok {
return errors.GetAPIErrorWithError(errors.ErrCORSUnsupportedMethod, fmt.Errorf("unsupported method is %s", m))
}
}
for _, h := range r.ExposeHeaders {
if h == wildcard {
return errors.GetAPIError(errors.ErrCORSWildcardExposeHeaders)
}
}
}
return nil
}